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A voiceprint was an electronically recorded representation of a voice in graphical format. Each voiceprint was unique to the individual speaker. They could sometimes be imitated by voice duplicators, but strong software could detect the deception.

They were commonly used security methods to identify individuals when accessing critical or secured information, including on turbolifts. They had (for the most part) replaced retinal scans between the 21st and 24th centuries.

Later that year, on Voyager's holodeck, the computer denied Tuvok from belaying the self-destruct command because his voiceprint was not recognized, due to the fact Seska had locked the holodeck systems. (VOY: "Worst Case Scenario")